Spindle Pulley for M155979 GX20335, John Deere 48" Deck L120 L130 LA130 LA140 S240 X140 Z245 Z255 Z355E Lawn Mowers (3 Pack)

What It Is

This is a set of three aftermarket spindle pulleys designed to replace the factory pulleys on 48-inch John Deere mower decks. They transfer drive belt power to the blades and are commonly needed for decks on L100, X100, and Z200 series tractors, as well as Z245, Z255, and Z355E zero-turn mowers.

Fitment & Compatibility

Before buying, confirm your deck size is exactly 48 inches – this pulley set does not fit 42-inch or 54-inch decks. Check your OEM part numbers: this set replaces M155979 and GX20335. It is compatible with John Deere models including L120, L130, LA130, LA140, S240, X140, Z245, Z255, and Z355E. Measure the pulley diameter (typically 4 inches) and center hole size (usually 5/8 inch) to verify match with your existing pulley. Note this is an aftermarket part, not OEM John Deere.

Key Things to Know

• Build quality: These are steel pulleys with sealed ball bearings. They are generally durable but may not last as long as OEM pulleys under heavy commercial use.
• Installation difficulty: Moderate. You’ll need a socket set, wrench, and possibly a puller to remove the old pulley. Expect 30–60 minutes per pulley.
• Common gotcha: The center hole may be slightly tighter than OEM – use a light file if needed. Also, check that the belt aligns properly after installation; misalignment causes rapid belt wear.
• Pack includes three pulleys – ideal if you’re replacing all at once, but you can also use them individually.

Should You Buy It

This is a good value for homeowners maintaining a single 48-inch John Deere deck who want to replace worn pulleys without paying OEM prices. It’s not recommended for commercial operators who need maximum longevity, but for occasional use, the cost savings are worth it.